The spinal cord sends and receives information to and from the brain. It is continuous with the brain stem.
3 Types of neurons:
1) AFFERENT- sensory n erves carry information from the body to the brain. 2) EFFERENT- motor nerves carry information from th e brain to the body. 3) INTERNEURONS- carry information between 2 neurons.
sciencephoto.com Grey Matter- butterfly shaped center portion of the spinal cord. It is the location of CELL BODIES in the spinal cord.
Dorsal Ganglion- dilated area. - site of the AFFERENT neurons CELL BODY.
Ventral Nerve Root- the region from the spinal cord to the spinal nerve containing only MOTOR fibers. Dorsal Nerve Root- the region from the spinal cord to the posterior spinal cord containing only SENSORY fibers. - dorsal ganglion is found here.
Receptor- nerve ending that MONITORS CHANGES IN THE EXTERNAL ENVIRONMENT. - initiate a sensory neuron’s action potential
Effector- tissue supplied by a motor neuron
sciencephoto.com Spinal Nerve- sensory information travels up the afferent fiber and directly stimulates the efferent neuron in the anterior grey horn of the spinal cord. - Efferent fiber then sends a signal to a muscle to move the body.
The spinal cord sends and receives information to and from the brain. It is continuous with the brain stem.
3 Types of neurons:
1) AFFERENT- sensory n
erves carry information from the body to the brain.
2) EFFERENT- motor nerves carry information from th e brain to the body.
3) INTERNEURONS- carry information between 2 neurons.
sciencephoto.com
Grey Matter- butterfly shaped center portion of the spinal cord.
It is the location of CELL BODIES in the spinal cord.
Dorsal Ganglion- dilated area.
- site of the AFFERENT neurons CELL BODY.
Ventral Nerve Root- the region from the spinal cord to the spinal nerve containing only MOTOR fibers.
Dorsal Nerve Root- the region from the spinal cord to the posterior spinal cord containing only SENSORY fibers.
- dorsal ganglion is found here.
Receptor- nerve ending that MONITORS CHANGES IN THE EXTERNAL ENVIRONMENT.
- initiate a sensory neuron’s action potential
Effector- tissue supplied by a motor neuron
sciencephoto.com
Spinal Nerve- sensory information travels up the afferent fiber and directly stimulates the efferent neuron in the anterior grey horn of the spinal cord.
- Efferent fiber then sends a signal to a muscle to move the body.